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idegen 06-21-09 03:45 PM

Replacement BB support cup for UN73
I over-torqued the plastic (non-drive) support cup on my UN73 bottom bracket and cracked it. Is the BB compatible with support cups off of other Shimano BBs (or even square tapered BB from other companies)? UN54 support cups seems to be much easier to come by than ones specifically for the UN73.

dobber 06-21-09 05:20 PM

Opps 54

z415 06-21-09 05:22 PM

I think newer Shimano BBs now reverted and come with the metal cups. If you plan on retaining the square taper style, I would just get a new bb and use the one from that.

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